in MVDEMO I see the highways displayed with line style and labeled with marker style to show the number inside the shield.

I tried to do the same with a point feature class. I created a marker of marker type vector (or image) with marker text definition and use this style two times, as rendering style and as labeling style. That works fine for whole image themes, I see the marker with lable inside correctly.

But I need a click event on the point objects so I need single FOI. I tried that but for single FOI the labels inside the marker symbol are not displayed. I tested displaying the highways in MVDEMO as single FOI and the marker label work fine there. But these are line features. What do I wrong with my points?